We also added a class mapping database.

我们还增加了一个类映射数据库。

youdao

I also added a base class.

我还添加了一个基类。

youdao

The disadvantages are that every time a new attribute is added anywhere in the class hierarchy a new attribute must be added to the table.

缺点是每次在类层次结构的任何地方添加一个新属性时都必须将一个新属性添加到表中。

youdao

So Zedan added a class at a time and, finally, as many as four in a semester.

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"The US Environmental Protection Agency has classified environmental tobacco smoke as a known human (class A) carcinogen, " he added.

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It added to his reputation as a high-class political act.

BBC: Joschka Fischer